Classification
000 - Computer science, information & general works
333 - Economics of land & energy
370 - Education
900 - History & geography
700 - The arts; fine & decorative arts
15
363 - Other social problems & services
10
330 - Economics
9
600 - Technology
9
620 - Engineering & allied operations
9
320 - Political science
7
380 - Commerce, communications & transportation
6
140 - Specific philosophical schools
4
340 - Law
3
576 - Genetics & evolution
3
720 - Architecture
3
200 - Religion
2
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
400 - Language
1
410 - Linguistics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
630 - Agriculture & related technologies
1
770 - Photography, photographs & computer art
1
780 - Music
1